Symptom Possible Causes Corrective Action
Defrost thermostat faulty Check defrost thermostat. Replace if
failed.
E
vaporator fan faulty Check fan motor. Replace if f
ailed.
Defrost heater remains open Check defrost heater continuity.
R
eplace if failed.
D
efrost control faulty Check control and replace if failed.
O
pen wire o
r connector Check wiring and connections.
Repair a
s necessary.
Frost or ice on evaporator
Refrigerant shortage or restriction Check for leak o
r restriction. Repair,
evacuate a
nd recharge system.
Loose wire o
r thermostat
connections
C
heck wiring and connections.
Repair as necessary.
Supply v
oltage out of specification Check input voltage. Correct any
su
pply problems.
Overload protector open Check overload p
rotector for
continuity. If open, replace overload.
N
OTE: E
nsure
overload/compressor are below
t
rip t
emperature before testing.
Faulty compressor m
otor capacitor
(some compressors d
o not require
motor capacitor)
Check capacitor for open/short.
R
eplace if necessary.
N
OTE: D
ischarge capacitor
before t
esting.
Faulty fan motor Check fan motor. Replace if f
ailed.
Restricted air flow Check condenser and grille f
or dirt.
Clean.
Unit starts a
nd stops frequently
(cycles on and off)
Refrigerant shortage or restriction Check for leak o
r restriction. Repair,
evacuate a
nd recharge system.
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